| A | B |
|---|
| What is the purpose of the NavRules | To prevent collisions between vessels. |
| What four factors do the NavRules establish? | Responsibilities, priorities, specific actions and means of communication. |
| To what vessels do the NavRules apply? | All vessels. Rule 1a. |
| Who is responsible for complying with the NavRules? | The person in command and all crew are responsible. Rule 2a. |
| What NavRules govern vessels on the high seas? | The International Regulations for Preventing Collisions at Sea, commonly called the COLREGS. Rule 1a. |
| What NavRules govern vessels on waters inside the United States? | The Inland Navigational Rules. Rule 1a. |
| How can you tell which rules apply | The boundaries are described in Inland Rules and Coast Pilots and marked on applicable charts. Introduction. |
| When is the potential for collision likely to be high? | When vessels are meeting, crossing or overtaking, and in or near areas of restricted visibility. |
| How is information needed to avoid collisions communicated? | By lights, day shapes, sound signals, light signals, radiotelephone and other means. |
| What precautions must the operator and crew take to avoid collisions? | All precautions required by the ordinary practice of seamen or by special circumstances of the case. |
| Under the NavRules, what is a power driven vessel? | Any vessel propelled by machinery. |
| Under the NavRules, what is a sailing vessel? | Any vessel propelled by Sail Alone. |
| Under the NavRules, when is a vessel engaged in fishing? | When fishing with gear which restricts her ability to maneuver. |
| When is a vessel not under command? | When some exceptional circumstance prevents her from maneuvering as required by the NavRules. |
| When is a vessel restricted in her ability to maneuver? | When the nature of her work prevents her from maneuvering as required by the NavRules. |
| When is a vessel underway? | When she is neither made fast to shore, aground, nor at anchor and not dragging. |
| When are vessels in sight of one another? | When and only when one can be visually (by eye) seen from the other. |
| When and how must a lookout be kept? | At all times, by sight, hearing and all other means available. |
| What factors should be considered in determining a safe speed? | Visibility, traffic density, background lights, current, wind and sea state, hazards, maneuverability, and draft relative to depth of water. |
| When does a risk of collision exist? | When the compass bearing of any part of an approaching vessel does not change. |
| When avoiding collision, how much should you alter course for your maneuver to be readily apparent to the other vessel? | Experience indicates that a change of 60 degrees can be easily recognized, even on radar. |
| If circumstances allow you to alter either speed or course to avoid collision, which would be better and why? | Alter course because it will be more obvious to the other vessel. |
| After acting to avoid a collision, what must you then do? | Watch to be sure that the action is effective until the other vessel is past and clear. |
| Which side of a narrow channel should you follow? | The starboard side. |
| What special care must a vessel under 20 meters take in a narrow channel? | She must not impede a vessel which can navigate only in the channel. |
| When a vessel is fishing in a narrow channel, over what other vessels is she the stand-on vessel? | Only over the overtaking vessels. |
| What must you do when crossing a narrow channel? | Stay clear of any vessel which can navigate only with the channel. |
| Under the COLREGS, when you intend to overtake another vessel in a narrow channel and she must take some action to let you pass, what signals must you sound? | If you intend to pass on her starboard side, sound two prolonged blasts and one shore blast. If on her port side, two prolonged blasts and two short blasts. |
| Under the COLREGS, in a narrow channel, when you must act to allow a vessel to pass you, how do you signal agreement with her proposal? | By sounding one prolonged blast, one short, one prolonged and one short blast. |
| Under the Inland Rules when overtaking in a narrow channel, what signals do you sound? | If you with to pass on her starboard, sound one short blast. If to port, sound two short blasts. |
| Under Inland Rules, if you are being overtaken in a narrow channel, how do you reply to the overtaking vessel's signals? | If it is safe and you agree, reply with the same signal. If you doubt its safety, reply with the danger signal of five short blasts. |
| Under COLREGS, what signals do sailing vessels make when overtaking in a narrow channel? | They make the same signals as power driven vessels. |
| Rules for the conduct of vessels in sight of one another apply when? | One vessel can be seen for the other. |
| The vessel directed to keep clear of another is called? | The give-way vessel. |
| The stand-on vessel may take avoiding action when? | As soon as it becomes obvious that the give-way vessel is not taking proper action. |
| A power driven stand-on vessel which must take action in a crossing situation should not alter course to ? | Port for a vessel on her port side. |
| When two sailing vessels at risk of collision have the wind on different sides, which is the give way vessel? | The vessel with the wind on her port side |
| When two sailing vessels at risk of collision have the wind on the same side, which is the give way vessel? | The windward vessel. |
| If a vessel with the wind on her port side cannot tell whether one to windward has the wind on her port or starboard side, what should she do? | She should give way. |
| In NAVRULES, which is the windward side of a sailing vessel? | If fore and aft rigged, the side opposite to that on which the mainsail is carried. |
| A vessel being overtaken has priority over? | Any overtaking vessel. |
| You are overtaking another vessel when? | At night you can see her tern light, but not her side lights. |
| You cease to be an overtaking vessel when? | When you are past and clear of the overtaken vessel. |
| When two vessels are meeting head-on, what action should each of them take? | Sound one short blast, and turn to starboard. |
| If you are not sure that a vessel is approaching you head-on, what actions should you take? | Assume that she is approaching head-on, sound one short blast, and turn to starboard. |
| When two power driven vessels are crossing so as to involve risk of collision, what actions should each take? | The one to port must keep clear. |
| Under the Inland Rules, on the Great Lakes, Western Rivers, and other specified waters, what special responsibility does a vessel crossing the river have with respect to other vessels? | She must keep clear of any vessels ascending or descending. |
| When a give-way vessel maneuvers to avoid another, what should she avoid doing? | Crossing ahead of the other if circumstances of the case permit. |
| When must a power driven vessel give way to a crossing vessel? | When the crossing vessel is approaching within a sector from dead ahead to 22 1/2 degrees abaft the starboard beam. ( the arch of the starboard side light) |
| Under both International and Inland Rules, when are maneuvering and warning signals given? | When the lookout on each vessel can see the other. |
| Under International Rules, what does a maneuvering signal indicate? | An action is being taken. |
| Under Inland Rules, what does a turning signal indicate? | An action is intended. |
| Three short blasts indicate? | A vessel operating astern propulsion. |
| Two short blasts indicate? | I am turning or intend to turn to port. |
| Five or more blasts mean? | Danger or Doubt. |
| What visual signal may be used to supplement whistle signals? | An all around light showing the same sequence of flashes. |
| Under Inland Rules, what signal is sounded when a vessel leaves a dock? | One prolonged blast. |
| When approaching a place where other vessels may be obscured by obstructions, what signal should be sounded? | One prolonged blast. |
| Under the Inland Rules, when are maneuvering signals not required? | When agreement has been reached by using the bridge to bridge radio telephone. |
| If agreement is not reached by using the bridge to bridge radio telephone, what must be done? | Exchange whistle signals which shall prevail. |
| What special precaution is necessary when using the bridge to bridge radio telephone? | Each vessel must know the other's identity and position. |
| A vessel not under command is a give way vessel with respect to? | A vessel which she is overtaking. |
| A vessel under 7 meters in length with a diver down must give way to? | A vessel not under command. |
| In restricted visibility, which is the stand-on vessel? | None. |
| If you detect a vessel on your radar, what must you do? | Use a radar plot or similar means to determine whether a close quarters situation exists or is likely to occur. |
| In fog, if you determine that a close quarters situation is developing with respect to a vessel forward of your beam, what should you avoid doing? | Avoid turning to port unless you are overtaking her and intend to pass on her port side. |
| In fog, if there is a close quarters situation with a vessel on or abaft the beam, what should you avoid doing.? | Avoid turning to port. |
| Unless you know that no risk of collision exists with a vessel forward of your beam, what must you do when you hear her fog signal? | Reduce speed to the minimum at which you can stay on course and, if necessary, stop. |
| What is the least speed at which very large vessels can be expected to stay on course? | Five or more knots. |
| When must you use the signals prescribed for restricted visibility? | In or near an area of restricted visibility. |
| In fog, do you also use the maneuvering signals for vessels in sight of each other? | No, it would be confusing because no one would know which vessel was signaling. |
| What is the maximum interval between repetitions of a fog signal? | Two minutes for vessels under way. One minute for vessels at anchor or aground. |
| In restricted visibility, what does one prolonged blast mean? | A power vessel making way. |
| When a power vessel is drifting with no way on, what fog signal does she sound? (underway but not making way) | Two prolonged blasts every two minutes or less. |
| What signal does a tug or vessel not under command sound in fog? | One prolonged and two short blasts. |
